Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution

Okko Jarvinen; Vishnu Unnikrishnan; Ilia Kempi; Kari Stadius; Marko Kosunen; Jussi Ryynanen

doi:10.1109/ISCAS48785.2022.9937816

Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution

Okko Jarvinen, Vishnu Unnikrishnan, Ilia Kempi, Kari Stadius, Marko Kosunen, Jussi Ryynanen

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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Abstract

Cyclic-coupled ring oscillators (CCRO), which consist of M ring oscillators each with N inverting stages, can be used in time-domain data converters to achieve sub-gate-delay resolution and improved phase noise performance compared to a single ring oscillator (RO). However, CCROs can oscillate in several different oscillation modes, where some modes contain overlapping phases. Such in-phase oscillations severely degrade the performance of a time-domain data converter by undermining the sub-gate-delay of the CCRO. This paper presents a design method to avoid the undesired in-phase oscillation modes, and thus achieve guaranteed maximal phase resolution regardless of the oscillation mode, by properly selecting the CCRO dimensions N and M. We show, both theoretically and with transistor-level simulations, that mode-agnostic maximum phase resolution can be ensured by selecting a prime M together with an N which is co-prime with M.

Original language	English
Title of host publication	IEEE International Symposium on Circuits and Systems, ISCAS 2022
Publisher	IEEE
Pages	1453-1456
Number of pages	4
ISBN (Electronic)	978-1-6654-8485-5
DOIs	https://doi.org/10.1109/ISCAS48785.2022.9937816
Publication status	Published - 2022
MoE publication type	A4 Article in a conference publication
Event	IEEE International Symposium on Circuits and Systems - Austin, United States Duration: 27 May 2022 → 1 Jun 2022

Publication series

Name	IEEE International Symposium on Circuits and Systems proceedings
ISSN (Print)	0271-4302
ISSN (Electronic)	2158-1525

Conference

Conference	IEEE International Symposium on Circuits and Systems
Abbreviated title	ISCAS
Country/Territory	United States
City	Austin
Period	27/05/2022 → 01/06/2022

Keywords

coprime
cyclic-coupled ring oscillator (CCRO)
phase resolution
prime
time-to-digital converter (TDC)

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10.1109/ISCAS48785.2022.9937816

ccro_phase_resolutionAccepted author manuscript, 349 KB

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Jarvinen, O., Unnikrishnan, V., Kempi, I., Stadius, K., Kosunen, M., & Ryynanen, J. (2022). Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution. In IEEE International Symposium on Circuits and Systems, ISCAS 2022 (pp. 1453-1456). (IEEE International Symposium on Circuits and Systems proceedings). IEEE. https://doi.org/10.1109/ISCAS48785.2022.9937816

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abstract = "Cyclic-coupled ring oscillators (CCRO), which consist of M ring oscillators each with N inverting stages, can be used in time-domain data converters to achieve sub-gate-delay resolution and improved phase noise performance compared to a single ring oscillator (RO). However, CCROs can oscillate in several different oscillation modes, where some modes contain overlapping phases. Such in-phase oscillations severely degrade the performance of a time-domain data converter by undermining the sub-gate-delay of the CCRO. This paper presents a design method to avoid the undesired in-phase oscillation modes, and thus achieve guaranteed maximal phase resolution regardless of the oscillation mode, by properly selecting the CCRO dimensions N and M. We show, both theoretically and with transistor-level simulations, that mode-agnostic maximum phase resolution can be ensured by selecting a prime M together with an N which is co-prime with M.",

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Jarvinen, O, Unnikrishnan, V, Kempi, I , Stadius, K , Kosunen, M & Ryynanen, J 2022, Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution. in IEEE International Symposium on Circuits and Systems, ISCAS 2022. IEEE International Symposium on Circuits and Systems proceedings, IEEE, pp. 1453-1456, IEEE International Symposium on Circuits and Systems, Austin, Texas, United States, 27/05/2022. https://doi.org/10.1109/ISCAS48785.2022.9937816

Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution. / Jarvinen, Okko; Unnikrishnan, Vishnu; Kempi, Ilia et al.

IEEE International Symposium on Circuits and Systems, ISCAS 2022. IEEE, 2022. p. 1453-1456 (IEEE International Symposium on Circuits and Systems proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Scientific › peer-review

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Design of Cyclic-Coupled Ring Oscillators with Guaranteed Maximal Phase Resolution

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Keywords

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